Closure for concrete mixers



July 25, 1933. J. EGGERT CLOSURE FOR CONCRETE MIXERS Filed June 2, 1931 Joseph Egqerr Patented July 25, 1933 1 UNITED STATES JOSEPH EGGERT, 0F COLUMBUS, OHIO, ASSIG-NOR TO THE JAEGER MACHINE COMPANY, 7

CLOSURE FOR CONCRETE MIXERS Application filed June 2, 1931.

This invention relates to closures for truck concrete mixing drums and particularly closures for the discharge opening of such a drum.

Where a" closure for a concrete mixer is turned up against a seat around a discharge opening of a truck concrete mixer with ordinary means it is likely to work loose and permit considerable leakage of the contents of the drum, hence the principal object of the invention is to provide means whereby considerable yielding pressure is applied to the closure after it has been turned to ordinary closing position. Other objects willbe ap- In the views the character 5 designates the mixing drum which is of the species in which the discharge is effected through a rear opening by reversing the rotations of the drum, said discharge opening being provided with an outwardly flared flange 5 the inner side of which constitutes a seat for the closure the latter designated 6. f

The closure 6 has a central hub 7 in the opening of which is fixed atube 8 that extends into the drum a considerable distance and around a closed extension 9 of a pipe 10 for supplying water to the mixing drum. Said extension 9 of the water supply pipe cooperates to form a support for the closure. The extension 9 is hollow at its rear end and provided with an internally-threaded thickened portion ll-forming a nut to receive a screw shaft 12. At its rear end (Fig. 2) the screw shaft 12 is smooth but provided with a'spline 13 to be operably Serial No. 541,654.

engaged by a hand wheel 23 so that the screw can be turned by turning said wheel. Between the splined end of the screw. shaft and the thread thereof is fixed an annular collar 14 that projects between the hub of the hand wheel and lugs 15 secured on the hub so that by turning the hand wheel the closure is drawn out or pushed in according to the direction the screw is turned by the hand wheel.

The end of the .splined shaft portion of the screw element in rear of the hand wheel has on it (Fig. 2) a coiled spring 16 retained thereon by a collar 17 secured on the splined portion so that after the closure has been ordinarily closed a considerably farther turning of the hand wheel in the closure closing direction causes a compression of said spring and the exertion of a stout but yielding pressure on the closure after it has been closed. Such extra and yielding pressure. prevents the closure from working loose by the joltings due to the transit of the truck over a rough road or the operation of the drum in the mixing operation in such transit. f

In each form a fibre washer 24 is inter posed between the annular collar 14 and the hub of the closure member to take the thrust of said collar in the closing movement of the closure member.

Referring now to Fig. 3 the construction is substantially the same as that depicted in Fig. 2 except that the shaft rear end of, the screw element is not splined but is cylindrical as shown at 17, and the screw is driven by the hand wheel through, several pins 18 secured to the hub of the hand wheel, said pins being extended through holes in a disk or collar 19 pinned to said cylindrical rear end. p

In the construction shown in Fig. 3 pressure is exerted on the closure by means of coil springs 20 around the pins 18 said springs being compressed by turning the 95 hand wheel in the closure closing direction as with the construction shown in Fig. 2.

In Fig. 4-the part corresponding to the .collar 14 in Fig. 2 is made as a ratchet wheel pawl 21 on the hub of the closure. As there is no tending of the closure to turn, especially when closed, the engagement of the pawl with the ratchet wheel resists tendency of the hand wheel to turn. Said pawl is, of course, disengaged for reversing the rotation of the hand wheel when the closure is to be removed from its seat to permit the discharge of the contents of the mixing drum.

In each instance Figs. 2 and 3 the increasing pressure of the spring or springs on the closure act as a brake exerting an increasing braking and therefore locking effect in the closing operation so that it is not always screw to engage said nut and closure for moving the closure to said opening.

2. In means of the kind described, a mixing vessel having an opening, a closure for said opening provided with a sleeve, means on the vessel for slidably supporting the closure at said sleeve, said means provided with a fixed nut, and a threaded shaft to engage said nut and closure for moving the closure to said opening, and means for exerting a resilient pressure on said closure after it is closed.

3. In means of the kind described, a mixing vessel having an opening, a closure for said opening provided with a sleeve, tubular means on the vessel for slidably supporting the closure at said sleeve, said tubular means provided with a fixed nut, and a threaded shaft to engage said nut and 010- sure for moving the closure to said opening.

4. In means of the kind described, a mixing vessel having an opening, aclosure for said opening provided with a sleeve, means on the vessel for slidably supporting the closure at said sleeve, said means provided With a nut, and a threaded shaft to engage said nut and closure for moving the closure to said opening, said shaft being rotatable independently of said closure.

5. In means of the kind described, a mixing vessel having an opening, a closure for said opening having a hub provided with a sleeve, means on the vessel for slidably supporting the closure at said sleeve, said means provided with a nut, and a threaded shaft to engage said nut and closure for moving the closure to said opening, said threaded shaft being rotatable independently of said closure, and means for exerting a resilient pressure on said closure after it is closed.

6. In means of the kind described, a mixing vessel having an opening, a closure for said opening provided with a sleeve, means connected with the vessel for slidably supporting the closureat said sleeve, said means provided with a nut, a screw shaft engaging said nut and said closure and manual means slidably engaged with said screw shaft to turn the same.

7. In means of the kind described, a mixing vessel having an opening, a closure for said opening provided with a sleeve, means on the vessel for slidably supporting the 010- sure at said sleeve, said means provided with a nut, a threaded shaft engaging said nut and said closure, manual means slidable on said threaded shaft for engaging said shaft to turn the same, and means for exertinga resilient pressure on said closure after it is closed.

8. In means of the kind described, a mixing vessel having an opening, a closure for said opening having a hub provided with a sleeve, means on the vessel for slidably supporting the closure at said sleeve, said means provided with a nut, a screw shaft engaging said nut and said closure, manual means slidable on said screw shaft for engaging said screw to turn the same, and means for exerting a resilient pressure on said manual means and closure after the closure is closed;

9. In means of the kind described, a mixing vessel having an opening, a closure for 'said opening having a hub provided with a sleeve, means on the vessel for slidably supporting the closure at said sleeve, said means provided with'a nut, a screw shaft engaging said nut and said closure, manual means slidable on said screw shaft for engaging said screw to turn the same, and means for latching said screw from turning when the closure is closed.

10. In means of the kind described, a mix ing vessel having a discharge opening, a closure for said opening having a hub provided with a sleeve, a tubular means within the vessel for slidably supporting said sleeve, said tubular support provided with a fixed nut and a manually operable screw engaging said fixed nut for moving the closure to and from said openin 11. In means of the kind described, a mixing vessel having a discharge opening, a closure for said opening having a hub provided with a slec 7e, a tubular means within the vessel for slidably supporting said sleeve, said tubular support provided with a fixed nut, a manually operable screw engaging said fixed nut for moving the closure to and from said opening, and means for exerting a resilient pressure on said closure after it is closed. I

JOSEPH EGGERT. 

